鋳鉄の高温度における各種硫黄ガスによる腐食について

概要

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Sulphidation of iron and steel at high temperatures is lately discussed in many literatures. The author has experimented on the sulphidation of cast iron at high temperature. In this report, he dealt with the corrosion of cast iron at high temperature in S vapour, CS_2 vapour, H_2S gas and SO_2 gas. The following results were obtained : (1) The sulphidation product of cast iron was composed of pyrrhotite Fe_<1-x>S. And from the X-ray analysis, it was found that the outer layer was composed of FeS and FeS_2 in S vapour, FeS in CS_2 vapour, FeS in H_2S gas and that FeS and Fe_3O_4 in SO_2 gas. In the outer layer C and P did not diffuse, on the contrary Mn diffused freely and Si did a little. (2) The sulphidation rate was controlled by the parabolic rate law, and the following formula was obtained : S vapour : W^2=0.36×10^<-8>t CS_2 vapour : W^2=0.64×10^<-7>t H_2S gas : W^2=1.15×10^<-6>t W : sulphidation rate, g/cm^2 SO_2 gas : W^2=0.12×10^<-7>t t : sulphidation time, s. (3) In this experiment, the sulphidation rate of cast iron in H_2S gas was superior to those in other gases, which followed in order of CS_2 vapour, SO_2 gas and S vapour.
社団法人日本鉄鋼協会の論文
1961-10-01